I'm trying to upgrade an XP machine to Windows 10, but I cannot get it to boot from DVD or USB flash drive. I formatted the old HDD, and, with Windows 10 in, I just keep getting a "cannot boot from DVD" error 5, but when I put an XP disc in, it has no problem installing XP again. With the USB, I get to "Searching for boot record from USB RMD-FDD..OK", and then it just stops there.
I followed the MS instructions to do both DVD and USB versions. How can I determine what is going wrong, and fix it?